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imx-drm: ipu-common: add helpers to check for a busy IDMAC channel and to busywait for an interrupt

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Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Philipp Zabel 2014-04-14 23:53:17 +02:00 committed by Russell King
parent 861a50c172
commit 1707550468
2 changed files with 25 additions and 0 deletions
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22
drivers/staging/imx-drm/ipu-v3/ipu-common.c
View file

@ -697,6 +697,12 @@ int ipu_idmac_enable_channel(struct ipuv3_channel *channel)
}
EXPORT_SYMBOL_GPL(ipu_idmac_enable_channel);
bool ipu_idmac_channel_busy(struct ipu_soc *ipu, unsigned int chno)
{
return (ipu_idmac_read(ipu, IDMAC_CHA_BUSY(chno)) & idma_mask(chno));
}
EXPORT_SYMBOL_GPL(ipu_idmac_channel_busy);
int ipu_idmac_wait_busy(struct ipuv3_channel *channel, int ms)
{
struct ipu_soc *ipu = channel->ipu;
@ -714,6 +720,22 @@ int ipu_idmac_wait_busy(struct ipuv3_channel *channel, int ms)
}
EXPORT_SYMBOL_GPL(ipu_idmac_wait_busy);
int ipu_wait_interrupt(struct ipu_soc *ipu, int irq, int ms)
{
unsigned long timeout;
timeout = jiffies + msecs_to_jiffies(ms);
ipu_cm_write(ipu, BIT(irq % 32), IPU_INT_STAT(irq / 32));
while (!(ipu_cm_read(ipu, IPU_INT_STAT(irq / 32) & BIT(irq % 32)))) {
if (time_after(jiffies, timeout))
return -ETIMEDOUT;
cpu_relax();
}
return 0;
}
EXPORT_SYMBOL_GPL(ipu_wait_interrupt);
int ipu_idmac_disable_channel(struct ipuv3_channel *channel)
{
struct ipu_soc *ipu = channel->ipu;

3
drivers/staging/imx-drm/ipu-v3/ipu-prv.h
View file

@ -185,6 +185,9 @@ void ipu_srm_dp_sync_update(struct ipu_soc *ipu);
int ipu_module_enable(struct ipu_soc *ipu, u32 mask);
int ipu_module_disable(struct ipu_soc *ipu, u32 mask);
bool ipu_idmac_channel_busy(struct ipu_soc *ipu, unsigned int chno);
int ipu_wait_interrupt(struct ipu_soc *ipu, int irq, int ms);
int ipu_di_init(struct ipu_soc *ipu, struct device *dev, int id,
unsigned long base, u32 module, struct clk *ipu_clk);
void ipu_di_exit(struct ipu_soc *ipu, int id);